Best of luck to ya.
No coues experience but I've hunted southern NM mulies a few times. While not a ghostly as the coues they are hard to spot.
I'd go with 15x quality glass and a really good tripod. A spotter is a great option as well.
I've changed things around a couple times from cheap and light to modest priced and light to a little more money and weight. I'm happy with the latter as it offers the most functionality and stability. As a bonus with an Acra rail I can shoot a long long ways from the prone to standing positions.
View attachment 703580